What is nutrition?

Nutrition is defined as the processes by which an animal or plant takes in and utilises food substances. In humans, nutrition is mainly achieved through the process of putting foods into our mouths, chewing and swallowing it. Essential nutrients include protein, carbohydrate, fat and electrolytes. Nutrition is essential for growth and development, health and wellbeing.

Something that we all do every day is eat. But eating can get complicated – there is a lot of variety and choice, and a lot of contradictory advice on what’s best for us. Dr Joe Kosterich explains the basics of what we need to eat.Watch a video about the basics of eating.

Measures of nutrition

There are many ways that the nutritional value of food can be measured, including by glycaemic index and glycaemic load. The effect of food on the body can also be measured by such tools as the body mass index and blood cholesterol testing.

Types and composition of food

We must eat a variety of foods, since different foods contain different nutrients in varying amounts. A healthy diet consists mainly of plant foods (e.g. fruits and vegetables, cereals) and moderate amounts of animal products (e.g. dairy, fish, lean red meat and poultry).

Nutrition and the body

Many people are concerned with not only their general health, but their appearance as well. Getting the best nutrition you can is essential for maintaining a healthy body and your natural beauty. What you eat can affect your skin, eyes, teeth and fertility.

Nutrition and people

The nutritional needs of children and adolescents are different to those of adults because children are growing and developing. Likewise, the nutritional needs of a woman who is pregnant or breastfeeding are different to those of men or elderly women because their bodies are under different demands.

Health conditions related to nutrition

Many health conditions are associated with food, either effecting the diet or resulting from the diet. These health conditions range from food allergies, to malnutrition or obesity, to anorexia and bulimia.

Diets and healthy food choices

Many consumers pick foods depending on the attraction and temptation of the item, but there are many things we should know to help us eat a nutritious and healthy diet. Consumers should also seek to know more about special diets, such as vegetarian diets, Mediterranean diets and liver cleansing diets, before choosing to follow them.